Amp 是一个 PHP 非阻塞并发框架，它提供了一个事件循环，promise 和 stream 作为异步编程的基础。与生成器结合使用的 promise 用于构建协程，它允许像同步代码一样编写异步代码，而不需要任何回调。
demo：
<?php
use Amp\Artax\Response;
use Amp\Loop;
require __DIR__ . '/../vendor/autoload.php';
Loop::run(function () {
$uris = [
"https://google.com/",
"https://github.com/",
"https://stackoverflow.com/",
];
$client = new Amp\Artax\DefaultClient;
$client->setOption(Amp\Artax\Client::OP_DISCARD_BODY, true);
try {
foreach ($uris as $uri) {
$promises[$uri] = $client->request($uri);
}
$responses = yield $promises;
foreach ($responses as $uri => $response) {
print $uri . " - " . $response->getStatus() . $response->getReason() . PHP_EOL;
}
} catch (Amp\Artax\HttpException $error) {
// If something goes wrong Amp will throw the exception where the promise was yielded.
// The Client::request() method itself will never throw directly, but returns a promise.
print $error->getMessage() . PHP_EOL;
}
});
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